| 1. | M 1 and M 2 have large protocone lobs.
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| 2. | In addition, they have a prominent protocone on their first, upper molars.
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| 3. | There is a protoflexus an indentation in the crown in front of the protocone.
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| 4. | The upper molars have four cusps : paracone, metacone, protocone, and hypocone.
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| 5. | There is a spur at the back of the protocone, suggesting a rudimentary hypocone.
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| 6. | The two cusps on the middle part of the molar, the paracone and the protocone, are broadly connected.
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| 7. | The main cusp is protocone; among the other two cusps, the paracone is higher but the metacone larger.
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| 8. | The protocone is connected to the paracone by a protoloph, which lacks a small cusp ( the paraconule ).
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| 9. | No crest connects the protocone to the metacone, but there is a cingulum at the back margin of the tooth.
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| 10. | In the cheek teeth of " Pakicetus ", the protocone lobe increases from the first molar to the third.
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